Portable lubricant pressure pump



Aug- 7, 1951 M. GARANCHER 2,563,716

PORTABLE LUBRICANT PRESSURE bPUMP Filed Dec. 20, 1947 2 Sheets-Sheet 1Aug. 7, 1951 M, GARANCHER 2,563,716

PORTABLE LUBRICANT PRESSURE PUMP Filed DGO. 20, 1947 2 Shee'tS-Sheet 2lmwm Patented Aug. 7, 1951 y 2,563,716 PORTABLE LUBRICANT PRESSURE PUMPMarcel Garancher, Chicago, Ill., assignor to Stewart-WarnerCorporation,Chicago, Ill., a corporation of Virginia Application December 20, 1947,Serial No. 792,911

18 Claims.

The present invention relates to dispensing apparatus, and moreparticularly to a manually portable power operated pump for dispensingfluids such as lubricant.

Aprimary object of the present invention is the provision of a new andimproved high pressure pump for dispensing fluids such as lubricantswhich is power operated and manually portable.

Another object of the invention is the provision of a new and improvedmotor operated fluid dispensing pump in which simplified means areprovided for controlling discharge of :duid when the motor is operating.

A further object of the invention is the provision of a new and improvedpower operated lubricant pump in which discharge of lubricant from thepump is controlled by co-operating valve means including a single valvemanually operable to open communication between the discharge side ofthe pump and the reservoir of the pump and thus discontinue discharge tothe parts to be lubricated, or to close the communication thusestablished for effecting discharge from the pump.

A still further object of the invention is the provision of a new andimproved power operated pump for dispensing fluids which has areciprocating pumping means and an improved driving connection betweenthe pump and the power means of exceedingly compact construction.

Another object of the invention is the provision of a new and improvedpump for dispensing fluids such as lubricant which has rotary powermeans and a reciprocating pumping means coaxially arranged with eachother and with a driving connection between the two for convertingtherotary action of the power means to reciprocatory motion.

Yet another object of the invention is the provision of a manuallyportable pump for dispensing fluids such as lubricant, which is ofcompact and generally improved construction and is simple andinexpensive to manufacture and assemble, so that its cost is low, butwhich nevertheless is durable and functions in a very satisfactorymanner.

These and other objects, advantages and capabilities of the inventionwill become apparent from the following description wherein reference ishad to the accompanying drawings, in which;

Fig. 1 is an axial section through the pump with the power means shownin elevation and a portion of the carrying handle shown; Fig. 2 is asectional View taken on the line 2-2 of Fig. 1;

Fig. 3 is a developed view of the double helical cam slots or threadsforming part of the driving connection between the power means and thepump plunger; and

Fig. 4 is a horizontal sectional View taken on the line 4-4 of Fig. 1,showing a planetary gearing forming part of the driving connectionbetween the power means and the pump.

Referring to Fig. 1, it will be seen that the improved pumpof thepresent invention has a body casting I0 which is adapted to be supportedupon a lubricant reservoir I2 and which supports the other elements ofthe pump. The vbody casting has internal threads I4 corresponding to theexternal threads on the top of the lubricant reservoir I 2 so that thepump may be readily engaged or disengaged from the reservoir. Thisreservoir may be specially constructed for the pump; or the body castingI0 may be so formed that it may be engaged upon conventional shippingcontainers for lubricant. The body casting I0 .has a depending extensionI6 of a length to terminate adjacent the bottom of the reservoir whenthe pump is in operative position, and it is provided with an axiallyextending opening of stepped diameter for housing the operatingmechanism of the pump.

The power means for driving the pump comprises a small high speedelectric motor I8 of, for example, 1/12 horsepower, which has a base 20that is engaged in an enlarged opening 22 in the top of the bodycasting. The base rests upon a ring gear 24 which is seated upon ashoulder 26 formed at the junction of opening 22 and a smaller opening28 in the casting, and the base 20 is secured to the casting and thering gear is locked against rotation by means of a series of bolts 3D,shown in Figs. 1 and 4, These bolts extend through the shoulder 26 incasting I0, ring gear 24, and base 20 and have nuts 32 threaded on theouter ends thereof into firm abutting engagement with the top side ofthe base. Annular gaskets 34 are preferably interposed between the ringgear and shoulder and the ring gear and casting to form alubricant-tight union between these parts.

The motor I8 drives a pump through epicyclic or planetary reductiongearing, best seen in Fig. 4, and it has a shaft 36 whichprojectsaxially into the opening 22 and which is provided with gearteeth 38, as indicated in Figs. 1 and 4, spaced from its lower end sothat this portion of the shaft forms the sun gear of the planetarygearing. This gearing also includes three 'freely rotatable planet gears40 meshing with the teeth on the motor shaft 36 and engaged with thepreviously mentioned stationary ring gear 24 so that these gears will berotated in a counterclockwise direction, as seen in Fig. 4. They willalso revolve aroundI the axis of the shaft in a clockwise direction,thus rotating a driving member, indicated in its entirety in Fig. 1A bythe number 42. This driving member is disposed in an opening 44 in thedepending extension I6 of the body casting in axial alignment with themotor shaft 36, and the planet gears rotate upon'pins 46 fixed in a head48 on the driving member. The'upper ends of the pins are interconnectedby a ring 50 which has apertures spaced to correspond with the spacingof the pins, and the pins extend through these apertures so that thering is carried between the head of thesepins andthe upa per end of thegears 40.

.The driving member 42 has a depending sleeve: like vextensionconsisting of a skirt 52 depending VVfrom'thehead of' the drivingmember, an'intermediate sleevelike member 54 and a sleevelike lower endmember 56. The latter `two members aresecured tothe skirt 52 on the headof the driving member bymeans ofV an external. sleeve 58 having itsopposite ends crimped over annular ribs on the lower end of the skirt 52and the; upper end of the lower endJmember 56, as indicated at when thedriving member is rotatedand cause with respect to each other when thedirection of movement of the operating head is reversed is not impededandthey will readily follow the thread The plunger '88 has a head 92' onits upper end .which seatsin a .recess in the lower end of the operatinghead and is secured thereto by a pin Sme/*extending` diametricallythrough the parts. The plunger extends through and is guided forvertical movement by-ineans of a guide member 96 housed in an opening 98inthe lower end of the eXten'Sionf-,I 6. "Guidexnember VBiis held' inposition by a plug I 00 threaded into aY bore [in "theV side wall ofextension" I6. Thisplug has atip engaged in a. slot in the side wallofthe guide` member 96.

Below the `Vguide member the plunger r88 extends through; a high;pressure` 'chamber I U2' which" vis formed in'p'art by; a1 'recessic'lin the lowerend "ofjguide memberii; and in partby a cavity lIll6Ellin'jEig. 1. These members are additionally securedtogether by anaxially extending Vcrimp 62 in the periphery of the sleeve 58 engaged inalignedgrooves in the skirt on the head of the driving member and theintermediate and lower sleevelike members, as indicated in Fig. 2.

Driving member 42 is guided for rotation by co- .operating meansincludingv an extension 64 on the Vmotor shaft 36 .below the gear teeththereon which projects 'into an aperture66 in 'the head 48 of jthe'drivingjmember and a counterbore 68 in Athe depending extension |6of the body castingwhich receives the lowerend ofthe lower` sleevemember '56A for rotation therein. A simple thrust bearing is provided,between the driving membex` andthe gendjofthemotor rshaftV consistingof a ball I'Illinserted-in the aperture BIinithev head of thejdriv- "ingmember. It will be'apparentr that'thisconnectionbetween thehead andshaftallowsA forro- .tationof theysh'aft anddriving member at differentspeeds. 'Rotarymovement of thefdrivingimember 42 j convertedv` toverticalreciprocatorymovement of anjoperating head assembly, indicatedat-l2 in Fig. 1, by cooperating cam follower means v74 carjried inthevoperating-head whichV engage in right` japdjleft-hand thread or camslots 'I6 formed in theinnerperipheral surface of the intermediatesleeve'memberjil of `thedriving member. The operating headY 'l2 isgenerally cylindrical and is "formed-in ariinsert '|08 threaded into thelower end of extension I 6. "A low pressure cylinder Ill) isVformedinthis insert in communication with 'the' high pressurechamb'er'IDZ., andthe plunger .88 has a piston II2 threaded'- on :itslower end Whichjis adapted toreciprocate in Vthegcylinder I I0. f InFig.; 1 the `plungerV 88` andV piston I |2-`are VCommunicationbetweenthe high pressure chamber I02 andthe pumpj cylinder IIiscontrolled byv avalvev ||4 surrounding the lower end of plunger 88Vand urged by?, spring II6 toward A its lower sidefwhichF engages -uponav'correspondadapted 'to be received in the opening defined Ywithintheidrivin'g member 42. A depending skirt -f I|l oni r the operatinghead slidably. engages in a bore. 80 in lthe depending extension I6 ofthebody casting vandfguidesthe vertical movement of this the plunger`andA valve.

ing ridge formedonfthe -upper 'endfof the cylinder II 0. 'A-wa'sher |20.'forming' a seat for the vvlower end of spring I I6 is engaged upon anannular shoulder formed in'the'upper edge of the cuplike Vmember. I-I8,and sealingy means |22includingia vleather *'packing -`washer and a`sealing ring 'of suitable material Yare Idisposed within the cuplikevalve memberl to formA alfluidtight 'seal between -outlet port |24 Sforthe @high pressure chamber |02 is formed in the rwall of "guidememlber-*96. "-T'Ihis outlet -port is.A closed by aball lcheck Avalve|26 urged vIto closed` position'. 'by'. at spring I28 Iprojecting Jfrom'-av recess in .i a plug L |38 head2 .'Rotation'of the operating headisprevented by a plurality of splinesv in the-wall off bore B0. oneofwhich is shown at j82; in -Fig 1, .cooperating withj registering. slotsin the skirt of V11ea'd"|2.

Atjits upperv endthejoperating head 'I2 has' a 7diametrically. extendingcylindrical recess as indie' cated at -84.in'Eigs. `1 and 2 forreceiving the two cam followers 14. l These followers have a peripheral.lipror tongue 86 thatis adapted to bev rethreaded into thel outer: endicfa .bore I 32 formed vin *a lateral boss |34 on. the extension f1.6.

"Through a'Y drilledfpassage |:3'65'the bore. |32 .is in`comm'unicationwith.adischarge pipeior conduit |36 secured to thenp'perXend-vofl the body casting =7I ll-bylafsuitablecouplingsleeve |40.SThe out-er 'endlofthis drilled-passage |361is vclosed '7' by lapluglI-EZ"threaded l therein. vA coupler |44 of conventionallconstruction Vfor connecting the pumpr to avil'pbricant receivingfitting onva`r part tobe lubricatedisfprovided on the outerend of.ceivedin the-opposite thread slots or `grooves 'IS intheintermed-iatesleeve 54.of ,the driving member. These projecting lips follow theslotsl 'the discharge condtfl 38;` Y

Discharge 'f-V lubricantfromthe'v high pressure chamber |02 occursduring the dOWILJSt'r'Qke` 'of the 'plunger 88 due to the fact that theplunger has portions of different volumetric displacement. It will benoted in Fig. 1, where the plungerl is shown at the top of its stroke,that the upper end of the plunger extending through the guide member 96is approximately double the diameter of the lower end which entendsthrough the high pressure chamber |82 and valve ||4 into the pumpcylinder ||0. During the down stroke of the plunger nits enlarged upperend will be projected into the high pressure chamber |02 and willdisplace a quantity of lubricant from this chamber through outlet port|24 equal to the amount by which the volumetric displacement of thisprojected part exceeds the volumetric displacement of the smaller lowerend which has moved out of the high pressure chamber.

A bypass for returning to the reservoir lubricant pumped by the pistonis formed by a radial port |46 intermediate the ends of the pumpcylinder which communicates with an annular passage |48 formed in theinsert |08. This latter -passage is in communication with an inclinedbore |50 in a lateral projection |52 on the lower end of extension |6through an inclined passage |54. The need for accurate location of thesepassages is eliminated because the annular passage |48 will alwaysestablish communication between the radial port |46 and the inclinedpassage |54.

In accordance with one of the features of the present invention, controlof flow of lubricant to the part to be lubricated is effected bycontrolling charging of the high pressure chamber |02 and this in turnis controlled by controlling iiow through the bypass means. This controlis effected through a manually operated plunger Valve |56 engagedadjacent its lower end in the bore |50, and at its upper end in a boreextending through the top of the body casting 0. This plunger has `asleeve |58 disposed thereon above a pin |60 extending diametricallythrough the plunger. A spring |62 engaged at opposite ends upon the pin|60 and the top side of projection |52 urges the plunger upwardly untilthe upper end of sleeve |58 engages the underside of body casting I0, asshown in Fig. 1. At this position of the valve the bypass passage isopen to the reservoir so that lubricant pumped by the piston will flowthrough the bypass back to the reservoir and hence insufcient pressurewill be developed to open valve 4 leading to high pressure chamber |02.As a result the high pressure chamber will not be charged and,therefore, no lubricant will be discharged to the part to be lubricatedeven though the motor is operating. If desired, a sealing ring |53 maybe secured in an annular groove in that portion of the periphery of theplunger valve which reciprocates in the bore |50.

For convenience in handling the pump, a handle |64, shown fragmentarilyin Fig. 1, is threaded into a boss |66 projecting from the body castingI0. Preferably the plunger valve |56 projects through the body castingadjacent the boss |66 so that the plunger can be operated by the thumbor one linger of the hand which holds the pump. A bail |68 may also beprovided on the reservoir |2 for carrying the pump from place to place.

Lubricant may be fed tothe operating parts in the extension above theguide member 96 through an aperture in the motor base which is closed bya screw plug |10. The gaskets 34 6 on each side of the ring gear 24 anda gasket |12 between a shoulder on the guide member 96 and a shoulder inthe opening 80 in the extension I6 prevent escape of this lubricant, Asealing ring |14 of suitable material is also provided between theinsert |08 and guide member 96 to prevent upward leakage of thelubricant being dispensed. i

Lubricant in the extension flows to the interior of the driving member42 through one or more ports |16 in the skirt 52 on -the driving member,and the upper end of the operating head has a port |18 communicatingwith the space between the cams '|4, while a second port |80 in the headfeeds lubricant to the head of plunger 88. The skirt 18 on operatinghead 'i2 is also provided with one or more ports |E2 suitably locatedadjacent its upper end to communicate with the interior of extension I6and thus prevent hydraulic locking of this part.

In the operation of my improved pump, when the plunger valve |56 is atthe position shown in Fig. l, no lubricant will be discharged by thepump even though the motor I8 is operating because the lubricant fed topump cylinder |||l is bypassed back to the reservoir |2 through radialport |46, annular passage |48, inclined passage |54, and bore |50.However, if the plunger |56 is depressed completely to close the end ofinclined passage |54, the pump will deliver a maximum amount oflubricant because the lubricant drawn into the pump cylinder |`|0 on thesuction stroke of the piston will be forced from the cylinder past valve||4 and into high pressure chamber |02 on the up stroke of the piston,

thus charging this chamber. On the down stroke of the plunger |56 thelarger upper end of this plunger will be projected downwardly into thehigh pressure chamber and its greater volumetric displacement, ascompared with the smaller lower end of the plunger which moves out ofthe chamber, will force lubricant past check valve |26 into outletpassage |36 and thence through discharge pipe |38 to the coupler |44.

In order to eliminate the need for accurately relating the volume oflubricant pumped by the piston ||2 on its up stroke to the volumedischarged by plunger 88 on its down stroke, the piston is made of suchdiameter that a slight clearance will exist between the piston and thewalls of cylinder HB. Thus, if the Volume displaced by plunger 88 isless than the capacity of piston ||2, the excess will escape around thepiston back to the reservoir. It is also to be noted that a suction isproduced in the high pressure chamber |02 by upward movement of thelarger end of the plunger. This assists in creating a flow of lubricantto this chamber lwhen the plunger valve |56 is closed.

From the above description of a preferred embodiment of the invention itwill be seen that the objects of the invention are attained. It willalso be apparent that numerous variations and modifications thereof maybe made without departing from the underlying principles of theinvention. I, therefore, desire by the following claims to includewithin the scope of the invention all such variations and modificationslby which substantially the results of my invention may be obtainedthrough the use of substantially the same or equivalent means.

I claim:

1. In a lubricant pumping apparatus having a lubricant reservoir andpower means for operating the apparatus, the combinationcomita-secure 1. prisingf. a zlucri'cant' discharging '.fpu'mp includingil au piston-andi plunger:.assemblySireciprocablekin one` directionlby;Vsaid :powermeansr forn charging :EsaidLpum'p and 1in-the*'oppositeldirection if'or-'ldisfchargingflubricaht 'tothe fpa'rttlbe'flubricated, means? forming4 av Abypass 'for Alubricant between "I saidpump and 'reservorgandlfmeanskforcontrolling charging of the pumpincluding afmanually operated valve `controlling "iiowfof lubricantthrough" said bypass, 'and a' "valve 'automatically operated to admitaChargeof-lubricant toi-'said pump during m'ovementof the-piston andplunger "assembly in" the lone said direction'l when said"manuallyfoperated valve" is operated to' close `'said bypass .Y Y s2.-*"A 'lubricant' pumping apparatusr asset forth inclaim` 1, whereinthe autmaticallyoperating `Yvalve is fpreload'ed automatically' toprevent charging of said pump 'when said 'manually' 'operatedvalve"isoper`a'ted to open said'bypa'ss.

3. AIn' a lubricant pumping apparatus having a v*lubricant reservoir,V"the combination V'comprising a' pump'cylinder having 'an v"inlet:con'imunicating with said reservoir, a power l operatedl piston fordischarging lubricant from said cylinder, -means forming abypass'establishing 'communieation between `said cylinder 'Y and'reservoir," a chamber for'receiving lubricantdischarged'by said piston"to charge saidehamber, 'diierential' means operating with said pistonto force lubricant from said charged chamber to the part to be lubritcated, valve means between said cylinderand said chamber controllingcharging'of' the latter, said Valve means being preloa'cled'tolpreventil'ow V"of'lubricant to said chamber'when'said bypass reservoir,means for connecting said'pump to al 'part tombe lubricated includinga.' chamber,Y said 'plunger 'extending through said chamber" and havingapart of increased volumetric displace- 'ment adapted to'be projectedtherein upon move- 'mentofthe plunger in one direction forv forcing i'lubricant to the part to be lubricated, and coop- "erating meansincluding a manually operated valve controlling said bypass and a valveauto- Amatically operated to admit lubricant to said lchamber uponmovement of the plunger in 'the vopposite direction when saidmanually'operated valve is in' a position closing said bypass.

5."In a lubricant pumping apparatus having a lubricant reservoir andpower means for' operat- `fing-the apparatus, the combination comprisinga 'pump cylinder having an inlet communicating 'fwith saidfrese'rvoir,'means forming 'a 'bypass establishing communication betweensaid cylin-.der". and J reservoir, a chamber communicating 'with saidcylinder forreceiving lubricantv diss. charged therefrom to 'chargethe chamber, aypiston in said 'cylinder fordischarginglubrcant therefrom,a'differentialY plunger operatedV by said :power means` for operatingsaid rpiston,"said j plunger having a'pcrtion of increased'volumetricdisplacement projectedinto said chamber upon movement of said plungercarrying ts'aid'f'piston through its suctionstrolce, said "portion beingVwithdrawn from said'chamber `to permit charging thereof upon movementof said Vplunger ac- Lil 1'ciprocablepistonand plunger assembl' A powermeans, a hollow generally cylindri'e'aldr-ivtu'ating' said piston: inH aVdischarging .I direction, cooperating means' controlling. chargingof'sad chamber' including -azfmanually'. operated 'valve iicontrollingfi'owof lubricant Athrough said bypass, -and a" `valve.-autopiatic'ailyoperated .toil admita Icha'rge 'of lubricant 1 'tosaid cham'ber'e'when.:said finanually'operated` valvefis: operated fto' close' said bypass. lv

I 6. Alubricant pumpingapp'aratusaslsetforth irr claim' 5,1 whe'reinthe?` automatically operated -valve :Tis lpr'eloaded automatically 'toiprevent i' 'charging' 'offi'said cham-ber when'sa'idl manually operatedvalve is 'operated to' open said bypass, `saidlatter' valve being'-biased tofop'enlfp'osition.

' '7. In:y a manually portable t mbricantrl pumping apparatus havingalubricant'ireservoirlthefcom- 'f bin'ation i confi'prisingaV body'-castinglvfor-supp'ort- Aing the operating parts of saidapparatus-ingaged u-pon ksaid', reservoir,l a handle risaidv bodycasting for` manipulatingsaidcoinpressorlap- '-l-para"tus, a .power4operatedlubricant discharging pump supported by fsaidlbodycastinggme'ans forming a bypasebetweensaid: p'umpfandre'serl Voir, meansfor? connecting said pump' to the' `part -to be lubricated; andcooperating valve m'eansfor controlling the" ow oflubricant to the'partito-be lubricated -inc'ludingva manually Voperated'f valve forcontrolling 'the' flow 'off lubricant through 'said 'bypass 'meansandian=automatically.'operating valve preloaded to preventnowlof-lubricant to the part to be lubricated-when saidfb'ypass' meansis open, said 'manually operatedva'lve havingia plunger supportedin'saidlbo'dy casting-.including a manipulatable partipositioned' topermit opera- `-"tionthereof by'fanger of thehand'hbldingfsaidapparatus.

'8. In. a lubricant-pumping:apparatuslhaving a lubricant reservoir;fthe' combination -coinp1'is ing a lubricant' discharging pump'havinga'f'ieo't'ary ing 'member rotated bysaid' power means ani operating headconnected to sa'idplunger-as'sembly andl constrained for reciprocatorymovementg-f's'aid "head having a'diametrically extending'-eylindrin .calopening; fccoperatinglmeansfor reciprocating said'operating head1` andplunger assemblylwh'en f said drivlng V4memberis rotated `-including'right `'.-andfle'ft'-hand thread slots inthe 'inner periphery 'of saidhollow'drivinlg:member andduplic'ate followersconformed to' beYloosely-"received 'inthe cated;` 'andimanually "operated controllmeansfor fi'controlling'il'ow ofilub'ricant-"fro'm said pump-"to apart to belubricated.

' '9. A lubricant'pumping: 'apparatusl assetforlth '1in Iclaim8,"wherein the rotarymotor,'idriving member, operating headf. and'reciprocable' plunger -z are axially' aligned.

l0.` Ina lubricant :pumping apparatus :havin ar lubricant reservointhe'combinationzcomprising a body casting having atiportionfiadapted'to beremovably engaged with. isaidreservoirand a 'hollow-extensionterminatingfadjacent the' bottom of said'vreservoini.'affpump'rcylinderuinrsaid 75 extension adjacent `thelowerfend'` thereoia; piston in said cylinder, a plunger forreciprocating said piston projecting longitudinally of said extension,rotary power means on the opposite end of said body casting from saidcylinder having a shaft projecting into said extension, a driving memberin said extension, means operatively connecting said power means anddriving member, an operating head Ain said extension operativelyconnected to said plunger, means for effecting reciprocatory movement ofsaid head and plunger upon rotation of said driving member includingrightv and left-hand thread slots in said driving member and camfollower means carried by said operating head for engaging in saidslots, means secured to said casting for connecting said apparatus to apart to be lubricated, and manually operated control means supported onsaid casting for initiating or discontinuing dow of lubricant to saidpart.

11. In a lubricant pumping apparatus having a lubricant reservoir, thecombination comprising a lubricant discharging pump including a plungerand piston reciprocated thereby for charging said pump upon movement ofthe same in one direction and for discharging lubricant to the part tobe lubricated upon movement in the opposite direction, rotary powermeans, means for reciprocating said plunger including a driving memberrotated by said powermeans and a reciprocal operating head connected tosaid plunger, said driving member and head having interengaging rightand left-hand thread slots and cam follower means cooperating toreciprocate said head and plunger when said driving member is rotated,means forming a bypass between said pump and reservoir, means forconnecting said apparatus to a part to be lubricated, and means forcontrolling charging of the pump including a manually operated valvecontrolling flow of lubricant through said bypass and a valveautomatically operated to admit a charge of lubricant to said pumpduring movement of the l piston and plunger assembly in the said onedisaid power means having portions of different f volumetricdisplacement, means for reciprocating said plunger, including a drivingmember rotated by said power means and a reciprocable operating headconnected for reciprocating said plunger, said driving member and headhaving interengaging right and left-hand thread slots and cam followermeans cooperating to reciprocate said head and plunger when, saiddriving member is rotated, means forming a bypass between said pump andreservoir, means for connecting said pump to a part to be lubricatedincluding a chamber, said plunger extending through said chamber andhaving a part of increased volumetricV displacement adapted to beprojected therein upon movement of the plunger in one direction forforcing lubricant to the part to be lubricated, cooperating meanscontrolling the flow of lubricant to said chamber including a manuallyoperated valve controlling said bypass, and a valve automaticallyoperated to admit lubricant to said chamber upon movement of the plungerin the opposite direction when said manually operated valve is operatedto aposition closing said bypass.

13. In a lubricant pumping apparatus having a lubricant reservoir andpower means for operating the apparatus, the combination comprising apump cylinder having an inlet communicating with said reservoir, apiston in said cylinder, a differential plunger for reciprocating saidpiston, means for reciprocating said plunger including a driving memberrotated by said power means and areciprocable operating head connectedto said plunger, said driving member and head having interengaging rightand left-hand thread slots and cam follower means cooperating toreciprocate said head and plunger when said driving member is rotated,means forming a bypass establishing communication between said pumpcylinder and reservoir, a chamber communicating with said cylinder andreceiving lubricant discharged by said pump for charging the chamber,said plunger having a portion of increased volumetric displacementadapted to be projected into said chamber for forcing lubricant thereinto the part to be lubricated when said chamber is charged, and means forcontrolling charging of said chamber including a manually operated valvecontrolling ilow of lubricant through said bypass, and a valveautomatically operated to admit a charge of lubricant to said chamberduring the discharge stroke of said piston when said manually operatedvalve is operated to a position closing said bypass. l

14. In a lubricant pumpingV apparatus continuously operable power means,lubricant pumping means including high and low pressure charnbers, apiston in said low pressure chamber for pumping lubricant to charge saidhigh pressure chamber, a differential plunger operated by said powermeans for operating said piston, said plunger having areas of, differentvolumetric displacement extending through said high pressure chamber foreffecting discharge of lubricant from the apparatus when the plunger ismoved in a direction to carry said piston through its suction stroke,means forming a passageway for bypassing lubricant from said lowpressure chamber to said reservoir, a manually controlled valve tocontrol communication through said bypass passageway, means forming apassageway to establish communication between said chambers, a checkvalve controlling communication between said two chambers, and a springto bias said valve to closed position, said spring exerting sunicientforce to resist opening of said check valve when said bypass passagewayis open but being yieldable to the pressure generated in said lowpressure chamber when said bypass passageway is closed during thedischarge stroke of the piston.

15. In a lubricant pumping apparatus the combination comprising a bodymember including a generally tubular extension, means in said eX-tension forming a rst and second pumping chamber and a passagewayinterconnecting said pumping chambers, a piston in said iirst chamberfor pumping lubricant under relatively low pressure to said secondchamber to charge the same, a reciprocatory plunger for operating saidpiston having areas of different volumetric displacement extendingthrough said second chamber for effecting discharge of lubricanttherefrom under high pressure while said piston is being retracted bysaid plunger, rotary power means, a driving member in said extensionrotated by said power means, means in said extension to establish adriving connection between said driving member and a plunger includingmeans for reciprocating said plunger in response to rotary movement ofthe driving member, means forming a by-pass africa-,ivre

passageway between vthe outlet `end vof 'said first;

chamberV and` said reservoir, -means -for establishing a connectionbetween :the f-secondfchamben,

meansfto bias saidf-checlivvalve atoclosedposition'w-ith aforce sufcientto resistfopening-:of

said-valve during the discharge:stroke-'ofsaid piston-when i said:by-pass passageway is .open-,- said means yielding to the pressure`generated-by fsaid' piston :when saidV by-passl passageway-:isnclosed-during the discharge stroke of the lpiston" to=-ad1nit-afchargeoflubricant to -saidsecond chamber.-

16;- Inalubricant pumping apparatus having a lubricantVreservoir,-:the-vcombination comprising a lubricant discharging pumphaving a reciprocable' piston `and plunger assembly, rotary powermeans,= alf-hollowl generally lcylindrical driving member; epicyclicreduction gearing driven by said lrotary power means and connectedtosaid driving memberfor driving thelatter, an operating head confnecrte'd `to saidfplunger vassembly vand:restrained ,1 for-reciprocatory.movement-,f saidhead having va diametrically extending cylindricalopening-cof,- operatingmeans for reciprocating said operating ci headand plunger assembly when said= driving, member Arotated including rightand left' hand th'readslots inthe innerperiphery of said hollowdrivingfmember andiduplica-te v:followers-:c011- formed tol be looselyreceivedrinthe diametrically extending :opening inV said operatinghead-and 1; having projecting lips to engage in -said :thread I slots atdiametrically oppositeupoints,` the conf. frontingends of saidfollowerseachihavingcor-V respondingly located :projecting abutments-'toprovide .bearingsurfaces between said followers for g facilitating irelative axial ioscillation- ,thereof in following said thread slots,meansfor connecting saidfapparatus toi afpart to bez-lubricated, andi"manual-ly'operated :control meansv :forxcontrolgling-:flow'fof-,lubricant from saidapparatusato a parttos be-:lubric'ated-`17.' In alubricant pumping apparatuS,-the come s. bination comprisingareser-Voir, aioodyy memberA secured to" one endofrsaid'reservoirand.having-5V a tubular. extensionv depending therein, lubricant;pumping .means in the lower endof saidextensionf1 including a4reciprocable Y piston and plunger-fase sembly, rotary power meanson.said.bod-ymenflbernr having a rotatable' shaft projecting intolsaideX-, tension-reduction gearing in said extension .driven froml saidshaft,y azgenerally-cylindrical. shapedf; driving member closed at`voneend and lrotatablyg vfjournaledat itsv other end in saideXtensiony-,said

controlled means tocontrolfiowof lubricant f1"0mAv .saidiapparatustothepart to be lubricated.

18. :A lubricant pumping :apparatus as denedx; iniclaim: 17 whereinwthecooperating :means w0nw said driving member;` and.. plunger fdr,reciprocate ingzthe latter inresponse to rotary movement 'of- :1 the,driving :member includes right and lefthand 4 thread islotson one ofsaid partsand-diametrically4 opposit'ely disposed thread. slot followersyfixed fto'v i the other parte,

` MARCELGARANCHER;

REFERENoEssciT-ED;

The following references are or-record inthe l'e #of this :patent: v

UNrrED; STATESfre'rrn'rsa Number: Name Date 1,316,558 Cannon-1, Sept.'2351919

